Which of the following is true of reverse transcriptase?a. It is required for the movement of DNA transposons.b. It catalyzes the synthesis of DNA from RNA.c. It is required for the transposition of retrotransposons.d. b and c are correct.

Why is it adaptive for a bacterium to not express the genes that encode that lactose utilization proteins when lactose is not available? a. Catabolism of lactose in protein transcription needs a lot of energy. b. The bacterium opts not to express the genes that encode proteins responsible for breaking down lactose to conserve enzymes. c. The bacterium opts not to express the genes that encode proteins responsible for breaking down lactose to conserve energy. d. The reason is conservation of energy for the enzyme. e. The bacterium opts not to express the genes that encode proteins responsible for breaking down lactose to conserve lactose.

Which of the following will lead to a decrease in transcription of a gene? A. Increase in histone acetyltransferases. B. Decrease in CpG methylation of promoter. C. Increase in histone deacetylases. D. Decrease in DNA methyltransferases.

Unusually high levels of Mdr1 provide stem cells with a. Nutrients needed b. Protection of their genomes from mutagenic agents c. Apoptotic factors d. Ability to differentiate

In a recent study, scientists used gene editing to treat both sickle cell disease and beta-thalassemia. How did they do this? O A. They suppressed the production of fetal hemoglobin. B. They inhibited transcription of BCL11A. O C. They suppressed the production of the abnormal adult hemoglobin. D. They inhibited transcription of the gamma-globin gene.

Two different types of gene regulatory elements are DNA sequence and protein-based. Which of the following describes them, respectively?   a. one blocks translation, the other blocks transcription   b. The first is an aporepressor, the second is a promoter   c. The first is an enhancer, the second is a repressor   d. The first is a activator, the second is a an attenuator   e. one is an activist, the other is a protestor

Methylation can alter the process of gene expression because: B. By causing DNA to coil more tightly. A. By derailing the cellular transcription machinery. C. By removing the gene from the genome altogether. D. ALL answers A, B and C are correct. E. Only answers A and B are correct, but not C.

All genes regulated by PKA contain a cis-acting DNA sequence that binds to the phosphorylated form of a transcription factor called (choose one answer)   a. CREB.   b. C-Jun.   c. beta-catenin.   d. TCF.

Cells that have deregulated expression of telomerase can become cancerous. This can be attributable to what? A. Telomerase can directly induce mutations in essential genes that can result in cancer. B. Telomerase allows cells to replicate indefinitely without end-shortening issues. C. Telomerase interferes with the function of repair enzyme complexes at the ends of the chromosome, causing DNA damages to persist. D. Telomerase inhibits regulators of the cell cycle leading to cancer.

Part A: Antibiotic resistance is a major health concern. Resistance to various antibiotics can be transferred by a. all options. b. transduction. c. conjugation. d. transformation.   Part B: Movement of genetic information through transduction requires that a. free DNA is available in the environment. b. physical contact occurs between cells. c. transposable elements occur in a chromosome. d. viruses have infected a cell.